Snatch-block.



PATENTED SEPT.18, 1906.

G. NETTLE. SNATCH BLOCK.

APPLICATION FILED JAN. 4, 1906.

2 SHEETS-SHEET l.

wi meazeo moron, a. c

No. 831,460. PATENTED SEPT. 18, 1906. G. NETTLE. SNATOH BLOCK.

APPLICATION FILED JAN. 4, 1906.

2 SHEETS-SHEET 2 UNITED sTATEs PATENT oEEIoE.

GUSTAV NETTLE, OF LEABURG, OREGON.

SNATCH-BLOCK.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application filed January 4, 1906. Serial No. 294.606. I

To all whom it may concern:

Be it known that I, GUsTAv NETTLE, a citizen of the United States,residing at Leaburg, in the county of Lane and State of Oregon, haveinvented certain new and useful Improvements in Snatch-Blocks; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to what are known as snatch-blocks for pulleysthatis, blocks so constructed and arranged that the swinging cross-headthereof may be thrown back on its pivot to receive the bight of a rope,chain, or cable without the trouble and annoyance of reeving the endthroughbut more particularly to logging-blocks for use in logging-campswith engines and cables. Among the other uses for which my device iswell adapted are for elevators and ferries.

Generally stated, the object is to provide an improved, novel, andsimple form of such blocks.

Another object is to construct the device'of my invention of a minimumnumber of parts, which shall be extremely inexpensive to manufacture. Inmany constructions where logging is done with engines the pulley of theblock turns on a pin, and in spite of utmost care and careful oilingfriction cannot be overcome, and the pin frequently burns out. By thepeculiar formation of my device binding and friction of the workingparts are reduced to a minimum, ninety per cent. of usual friction beineliminated, and there is a saving of seventy-five per cent. oflubricant, twentyfive per cent. of wear on the cable, and twenty fivepercent. ofpower required. In many constructions also the full weight ortension of the cable on the pulley comes on the block carrying thepulley.

Another object, therefore, is to relieve the block of my device of suchstrain, and I effect this by providing a novel form of straps(hereinafter described) which receive the strain of the line or cable. Iam also enabled by the use of my strap to raise one face or jaw of theblock to fill the lubricant-chamber, if necessary, while the line orcable is .tight on the pulley and without any danger of the pulleybecoming disengaged from and falling out of I the block.

Moreover, the object of my invention is to improve the general andspecific construction of the device forming the subject-matter of myPatent No. 779,437.

In my present device the specific improvements and differences over mypatented structure reside, among others, in the particulars noted, asfollows:

First. I form the front (or each) jaw, shell, or frame-plate of theblock with an extended cut-away portion for the reception of a strap andwith a transverse securing-strip extending transversely of the cut-awayportion and the jaw, all for purposes hereinafter appear- H10.

Second. I form the sheave or pulley with a central countersunk portionon each of its front and rear surfaces, for a pur ose hereinafterappearing. Also instead 0 having the exits of the oil-holes in theraceway of the antifriction-balls (as in my patenteddevice) I form theexits at the countersunk portions of the pulley, thus preventing theoil-holes being stopped up by dirt, dust, &c., as they would when theirexits are in the raceway,

and I provide efiicient means for protecting the oil-holes from entranceof outside dirt and dust and for reventing the oil from running out ontot e exterior surfaces of they block, all as hereinafter explained.

Third. I form the cone disposed in the central opening of the sheave orpulley with removable bushings or sleeves, the object of these removablesleeves or bushings being to overcome wear on the cone, the sleeves bybeing removable being capable of being re- .placedwhen worn by new onesat very little ,=cost. 7

With these and other object in view the invention consists in andcomprehends the novel construction, combination, and ar ,rangement ofparts of a device characterized by my invention, as hereinafter fullydescribed in the specification, summed up in the claims, and illustratedin the drawings.

In the accompanying drawings, Figure 1 is a front elevation of mydevice, the swinging cross-head when thrown up for insertion of a loopor bight of rope without the necessity of having to reeve the endthrough being indicated in dotted lines. Fig. 2 is a side elevation ofmy device, the front jaw being thrown open and upward for the purpose ofpermitting filling of the oil or lubricant chamberi n 8 is a detail viewof the axle-pin of my device. Fig. 9 is a vertical transverse sectionrial, preferably through my sheave with the cone therein.

Referring in detail to the drawings, the block, as shown, comprises twojaws, shells, or frame-plates A A, of any suitable mate- H of somemetal, such as iron or steel, and of the shape shown, by preference witha substantially circular or bulged lower portion and a reduced neck-likeupper V portion terminating in end knobs a a.

rom the top of the front jaw A to a point I desirably below the centerof the bulged be similarly cut away, if desired.

V pulley lower portion I cut away the jaw, as shown at a In thisinstance the front jaw only is so cut away; but the other jaw A may alsoExtending transversely of the face or front jaw A and desirably disposedtoward the top of the bulged portion thereof and extending across thecut-away portion is a retainingstrip a provided midway of its ends withan opening a.

Adapted to be disposed in and exactly to fit the cut-away portion a is astrap (L provided with a perforation a registering wit the opening a andwith two end knobs (1 the strap between the knobs being cut away, as ata A headed pin a is screwed transversely through the alining openings aa thus temporarily holding the A and the strap a against independentmovement. A bolt (1 passes transversely through the strap a and theplate A, and a nut a screwed on each end of the bolt, clamps togetherthe jaw A and the strap a In the cut-away portion a is adapted to fitone end of a swinging cross-head a, the other end fitting in a similarcut-away portion a of the rear or back jaw A, the swinging cross-headcarrying the usual strong swiveled hook, eye, or ring B. A removabledowel-pin a passes through the various knobs, as shown, affordingpivotal action of the jaws on such dowel-pins.

Supported between the two jaws A A is a or sheave O, which may be of anysuitable material, such as steel or iron, casehardened and tempered, andhas the usual central opening C and is provided on each face withsimilar countersunk portions 0 and (preferably on one face only) with aseries of screw-plugs c, disposed in openings or passages c leading toan annular lubricantchamber 0 located internally and concenj trically ofthe pulley and whereby the lubrij cantchamber may be supplied withsuitable lubricant, a number of these screw-plugs be mg provided,preferably so that the lubricant-chamber may be filled at any time, nomatter what may be the position of the pulley, by simply unscrewing oneof the headed pins a and swinging up and back the jaw A on its pivotdowel-pin, as shown in Fig. 2. Inclined passages 0 lead from theinternal lubricant-chamber and have their exits c in the countersunkportions 0, grooves leading thence to the edge of and emptying into theopening 0. The wall of opening C is hollowed or dished out, as shown at0 to form part of a raceway for the antifriction balls or rollershereinafter described.

Adapted to occupy the opening 0 of the sheave is a cone formed in twosections or members, one member, constituting the top section,comprising a circular plate D, provided with a central opening d and aninternal-threaded neck portion (1 surrounding the opening (1.Surrounding the neck (1 is a removable bushing or sleeve (i at the topdownward and outward beveled, as at d.

the base-section, comprises a similar circular plate D, providedcentrally with a circular offset portion d terminating in a reducedexternallythreaded neck (1 to engage the internally-threaded neck (1 ofthe other member, a square opening 61 being drilled through the plate,the circular offset portion, and the neck, as shown. Surrounding thecircular offset portion d is a removable bushing or sleeve (i at the topdownward and outward beveled, as shown at d". When the two sections ofthe cone are screwed together, the bevels d and (1, together with thedishedout portion 0 of the sheave, constitute a raceway for antifrictionballs or rollers (1 To assemble the cone with the sheave, the basemember of the cone is inserted in the central opening C of the sheaveand the balls inserted around the raceway. The other member of the coneis then screwed down upon the base member, preventing falling out of theballs.

The bushings or sleeves 0Z d are made re movable, so that they can bereplaced as worn by new bushings at very little cost, and these bushingsare valuable as overcoming wear which would otherwise come on the cone.Therefore the bushings are an impor tant feature of my presentinvention.

It will be noted that the plates or flanges D D of the cone rest in thecountersunk portions 0, covering the oil-exits c and the oilgrooves 0preventing entrance of outside dirt and dust thereto. This also isanother valuable feature of my invention.

As shown in Fig. 8, the axle-pin a is square in cross-section. This pin,supporting the cone by passing through the central The other member ofthe cone, constituting gether extend slightly beyond the level or planeof each face-surface of the pulley or sheave, so that when my device isin operative position the strap or straps a (where two are employed)rest on the flanges D D, thus giving the pulley free movement or play atall times and obviating any possible binding. In the devices of manypatents there are no means shown or provided to stay the shells apartwhen in position, so that when a heavy weight is placed on the ropepassing over the pulley in these previous constructions it causes theshells to bear in upon the pulley, binding it so tightly as to preventturning or rotation thereof with any degree of ease and facility. Mypeculiar construction remedies this difficulty.

The wear strap or straps a form a valuable feature of my invention, asthey receive the strain of the line or cable, which would otherwise comeentirely on the jaws of the block.

- Various minor modifications in the nature of detail will readilysuggest themselves to those skilled in the art; but all such slightchanges not involving a departure from the spirit of my invention comeclearly within the scope and purview'thereof.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In a snatch-block, two jaws, provided each with a long opening orslotvcut transversely therethrough and extending from the top toward thebottom thereof, straps or plates fitting in said openings, and means forholding the jaws spaced apart.

2. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, and means for holding thejaws spaced apart, such means also holding together the jaws and thestraps.

3. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward'the bottom thereof,straps or plates fittingin said openings, and means for holding the jawsspaced apart, such means also holding together the jaws and the strapsand permitting pivotal movement of the jaws thereon.

4. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, and means for holding thejaws spaced apart, such means also holding together the jaws and thestraps and permitting pivotal movement of the straps thereon.

5. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, and means for holding thejaws spaced apart, such means also holding together the jaws and thestraps and permitting pivotal movementthereon ofsaid jaws and straps.

6. In a snatch-block, two jaws provided each with a long opening or slottherethrough, 1

extending from the top toward the bottom thereof, straps or platesfitting in said openings, means located at the top of the jaws and thestraps for spacing the jaws apart, such means also holding together thejaws and the straps, and additional means, located below and independentof the firstmentioned means, for temporarily securing the jaws and thestraps against independent movement.

7. In a snatch-blook, two jaws, provided head, the jaws and the strapsfor holding together the jaws and the straps relative to the cross-head,and constructed to permit pivotal movement of the jaws and the strapsthereon.

9. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, a swinging cross-head forspacing the jaws apart, and means engaging the crosshead, the jaws andthe straps for holding together the jaws and the straps relative to thecross-head, and constructed to permit independent'pivotal movement ofthe jaws and the straps'thereon.

- 10. In a snatch-block, two jaws, provided each with a long opening orslot therethrough,

:extending from the top toward the bottom thereof, straps or platesfitting in said openings, a swinging cross-head for spacing the jawsapart, and a dowel-pin passing through the cross-head, the jaws and thestraps.

11. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, a swinging cross-head forspacing the IIO jaws apart, means engaging the cross-head, the jaws andthe straps for holding together the jaws and the straps relative to thecrosshead, and constructed to permit pivotal movement of the jaws andthe straps thereon, and strips or bars disposed transversely of andsecured to the jaws and constructed to permit temporary clamping of thejaws and the straps against independent movement.

12. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, a swinging cross-head forspacing the jaws apart, means engaging the cross-head, the jaws and thestraps for holding together the jaws and the straps relative to thecrosshead, and constructed to permit pivotal movement of the jaws andthe straps thereon, strips or bars disposed transversely of and securedto the jaws, the straps and thetransverse strips being provided withalinin openings, and means passing through sai openings for temporarilyclamping the jaws and the straps against independent movement.

13. In a snatch-block, two jaws, provided each with a long opening orslot therethrough, extending from the top toward the bottom thereof,straps or plates fitting in said openings, and provided with openingstherethrough near their lower ends, a swinging cross-head for spacingthe jaws apart, means engaging the cross-head, the jaws and the strapsfor holding together the jaws and the straps relative to the cross-head,and means passing through the openings in the lower ends of the strapsfor temporarily securing them a ainst independent movement.

14. n a snatch-block, two jaws carrying a pulley and provided each witha long opening or slot therethrough extending from the top toward thebottom thereof, said pulley being provided with a central opening andwith countersunk portions, in each face, adjacent to said opening.

15. In a snatch-block, two jaws carrying a pulley and provided each withan extended opening or slot therethrough running from the top to a pointtoward the bottom thereof, said pulley being provided with a centralopening, with countersunk portions, in each face, adjacent to saidopening, and with an internal lubricant-chamber.

16. In a snatch-block, two jaws carrying a pulley and provided each witha long opening or slot therethrough extending from the top to a pointtoward the bottom thereof, said pulley being provided with a centralopening and with countersunk portions, in each face, adjacent to saidopening, and a ball-bearing cone disposed in the central opening of thepulley. V

17. In a snatch-block, two jaws carrying a pulley and provided each witha long opening or slot therethrough extending from the top to a pointtoward the bottom thereof, said pulley being provided with a centralopening, and a ball-bearing cone disposed in the central opening of thepulley and provided with flanges adapted to fit in the countersunkportions.

18. In a snatch-block, two jaws carrying pulley and provided each with along opening or slot therethrou h extending from the top to a pointtowar the bottom thereof, said pulley being provided with a centralopening and with countersunk portions, in each face, adjacent to saidopening, and a.ballbearing cone disposed in the central opening of theulley and formed in two sections, and provided with flanges adapted tofit in the countersunk portions of the pulley.

19; In a snatch-block, two jaws carrying a pulley and provided each witha long opening or slot therethrough extending from the top to a pointtoward the bottom thereof, said pulley being provided with a centralopening and with countersunk portions, in eachface, adjacent to saidopening, and a ball-bearing cone disposed in the central opening of thepulley and formed in two sections, and provided with flanges adapted tofit in the countersunk portions of the pulley, each said section of thecone being provided with removable bushings or sleeves on which theballs run.

20. In a snatch-block, two jaws carrying an automatic, self-lubricatingpulley and provided each with a long opening or slot therethroughextending from the top to a point toward the bottom thereof, and strapsor plates fitting in said openings, said pulley being provided with acentral opening and with countersunk portions, on each face, adjacent tosaid central opening.

In testimony whereof I afiix my signature in the presence of twosubscribing witnesses.

GUSTAV NETTLE.

Witnesses OBEL OBRIEN, FELIX SPARKS.

